/Engine/Source/Runtime/GeometryCore/Public/MeshQueries.h
Compute the min, max, and mean edge lengths for the given mesh. Optionally, choose a subest of size NumSamples and compute stats of that subset.
static void EdgeLengthStats ( const TriangleMeshType & Mesh, double & MinEdgeLength, double & MaxEdgeLength, double & AverageEdgeLength, int NumSamples )